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      Stomatal optimization based on xylem hydraulics (SOX) improves land surface model simulation of vegetation responses to climate

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          Summary

          • Land surface models (LSMs) typically use empirical functions to represent vegetation responses to soil drought. These functions largely neglect recent advances in plant ecophysiology that link xylem hydraulic functioning with stomatal responses to climate.

          • We developed an analytical stomatal optimization model based on xylem hydraulics (SOX) to predict plant responses to drought. Coupling SOX to the Joint UK Land Environment Simulator (JULES) LSM, we conducted a global evaluation of SOX against leaf‐ and ecosystem‐level observations.

          • SOX simulates leaf stomatal conductance responses to climate for woody plants more accurately and parsimoniously than the existing JULES stomatal conductance model. An ecosystem‐level evaluation at 70 eddy flux sites shows that SOX decreases the sensitivity of gross primary productivity (GPP) to soil moisture, which improves the model agreement with observations and increases the predicted annual GPP by 30% in relation to JULES. SOX decreases JULES root‐mean‐square error in GPP by up to 45% in evergreen tropical forests, and can simulate realistic patterns of canopy water potential and soil water dynamics at the studied sites.

          • SOX provides a parsimonious way to incorporate recent advances in plant hydraulics and optimality theory into LSMs, and an alternative to empirical stress factors.

          Abstract

          See also the Commentary on this article by Anderegg & Venturas, 226: 1535–1538 .

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          FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem–Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities

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            Development of a global land cover characteristics database and IGBP DISCover from 1 km AVHRR data

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                Author and article information

                Contributors
                c.breder-eller@exeter.ac.uk
                Journal
                New Phytol
                New Phytol
                10.1111/(ISSN)1469-8137
                NPH
                The New Phytologist
                John Wiley and Sons Inc. (Hoboken )
                0028-646X
                1469-8137
                17 February 2020
                June 2020
                : 226
                : 6 ( doiID: 10.1111/nph.v226.6 )
                : 1622-1637
                Affiliations
                [ 1 ] College of Life and Environmental Sciences University of Exeter Exeter EX4 4QF UK
                [ 2 ] Department of Plant Biology University of Campinas Campinas 13083‐862 Brazil
                [ 3 ] CREAF Bellaterra 08193 Barcelona Spain
                [ 4 ] ICREA Pg. Lluís Companys 23 08010 Barcelona Spain
                [ 5 ] Met Office Hadley Centre Fitzroy Road Exeter EX1 3PB UK
                [ 6 ] College of Engineering, Mathematics and Physical Sciences University of Exeter Exeter EX4 4QF UK
                [ 7 ] Hawkesbury Institute for the Environment Western Sydney University Locked Bag 1797 Penrith NSW 2751 Australia
                [ 8 ] Department of Plant & Environmental Sciences Weizmann Institute of Science 76100 Rehovot Israel
                [ 9 ] Institute of Biological Sciences Federal University of Pará Belém 66075‐110 Brazil
                [ 10 ] Department of Ecology – IBRAG Rio de Janeiro State University (UERJ) Rio de Janeiro 20550‐013 Brazil
                [ 11 ] Department of Environmental Systems Science ETH Zurich Universitätstrasse 2 8092 Zurich Switzerland
                [ 12 ] Department of Ecology University of Innsbruck Innsbruck 6020 Austria
                [ 13 ] Forest Services Autonomous Province of Bolzano Via Brennero 6 39100 Bolzano Italy
                [ 14 ] Research School of Biology The Australian National University Acton ACT 2601 Australia
                [ 15 ] School of Geosciences University of Edinburgh Edinburgh EH9 3FF UK
                Author notes
                [*] [* ] Author for correspondence:

                Cleiton B. Eller

                Tel: +44 07864 755668

                Email: c.breder-eller@ 123456exeter.ac.uk

                Author information
                https://orcid.org/0000-0002-7795-2574
                https://orcid.org/0000-0002-0774-3216
                https://orcid.org/0000-0003-0840-1477
                https://orcid.org/0000-0002-8734-9752
                https://orcid.org/0000-0002-1185-535X
                https://orcid.org/0000-0001-7294-6039
                https://orcid.org/0000-0001-5728-9827
                https://orcid.org/0000-0002-2588-9278
                https://orcid.org/0000-0002-3882-8845
                https://orcid.org/0000-0002-5528-8828
                https://orcid.org/0000-0002-6392-2526
                https://orcid.org/0000-0001-5557-5133
                https://orcid.org/0000-0002-8924-8672
                https://orcid.org/0000-0003-1776-283X
                https://orcid.org/0000-0003-3080-6702
                https://orcid.org/0000-0003-4412-4243
                https://orcid.org/0000-0002-2362-0398
                https://orcid.org/0000-0003-1821-8561
                https://orcid.org/0000-0002-0679-2219
                Article
                NPH16419 2019-31667
                10.1111/nph.16419
                7318565
                31916258
                28457527-21d6-4f0b-8d98-09ea38a5052b
                © 2020 The Authors. New Phytologist © 2020 New Phytologist Trust

                This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

                History
                : 05 November 2019
                : 03 January 2020
                Page count
                Figures: 6, Tables: 3, Pages: 16, Words: 13414
                Funding
                Funded by: Newton Fund , open-funder-registry 10.13039/100010897;
                Funded by: NERC , open-funder-registry 10.13039/501100000270;
                Award ID: NE/N014022/1
                Categories
                Full Paper
                Research
                Full Papers
                Custom metadata
                2.0
                June 2020
                Converter:WILEY_ML3GV2_TO_JATSPMC version:5.8.4 mode:remove_FC converted:26.06.2020

                Plant science & Botany
                climate change,drought,eddy covariance,land‐surface models,stomatal optimization,xylem hydraulics

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